Where's the logic?

80 degrees is always 80 degrees.  Same with 32, same with 45, same with 2 or 14, right?  Those are finite, measurable things that can not be changed.  They are facts, true and uncontestable.

So, why is it that yesterday, when the temperature was 45 degrees outside, I was walking around without a coat on and was warm and comfortable?  Why is it that 45 degrees feels almost balmy after a high of 2 degrees, and almost artic after a high of 80 degrees?  It’s the same damn temperature!